<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<style>
    div{ width: 150px; height: 60px; background: skyblue;
        overflow: hidden;  /*溢出隐藏*/
    }
</style>

<div >
    今天天气很好！<br>今天天气很好！<br>
    今天天气很好！<br>今天天气很好！<br>
</div>
</body>
</html>